Furnace arch



jufiy 8 119240 J. W. GATES FURNACE ARCH Filed May 11 1923 Patented July 8, 1924.

JOHN WILLIAM GATES, OF MONTREAI-Ji QUEBEC, CANADA.

FURNACE Application filed May 11,

To all whom/it may concern:

Be it known that I, JOHN \VILLIAM GATES, a subject of the King of Great Britain, and residing at the city of Montreal, in the Province of Quebec, in the Dominion of Canada, have invented a new and useful Furnace Arch, of which the following is the specification;

The invention relates to a furnace arch as described in the present specification and shown in the accompanying drawings that form part of the same.

The invention consists essentially of the novel features pointed out broadly and specifically in the claims for novelty following a description containing an explanation in detail of an acceptable formv of the invention.

The objects of the inventionare to preserve the arch by maintaining a continuous sheet of air over the inner surface, thereby materially reducing the temperature of the bricks forming the arch and consequently avoid the destructiveness of great heat and the resulting deterioration of the structure; to promote combustion of the fuel and increase the volume of the heating gases; and generally to provide an efficient, economical and durable arch in furnace construction.

In the drawings, Figure 1 is a longitudinal sectional view of the arch and fire box, showing the invention in the arch bricks and tubes illustrated.

Figure 2 is a cross sectional view of a portion of the arch and fire box and the invention illustrated therein taken on the line 22 in Figure 1.

Figure 3 is an enlarged sectional detail on the line 3-3 in Figure 2 showing an arch brick and a fragmentary view of a tube on the line'-33 in Figure 5.

Figure 4 is a perspective detail of a brick.

Figure 5 is a fragmentary view of a longitudinal tube showing an air passage.

Like numerals of reference indicate corresponding parts in the various figures.

' Referring to the drawings, the arch bricks 1 are 1 formed of refractory material as customary and have upper longitudinalv sides reduced to form the tube recesses 2 and 3 with arc-shaped beds and undercut walls, so that when the bricks are brought together a bed'is made for the longitudinal tubes 4.

The bricks 1 are slotted in the sides below the longitudinal recess bed, these slots 5 being comparatively shallow, but extend- 1923. 7 Serial No. 638,279.

ing from the top to the bottom of the bricks and flaring outwardly at their lower ends 6 from which .the channels 7 and 8 lead on to the tapered bottoms of the bricks, the flutings in the bricks forming the channels 7 and 8 gradually becoming shallower and shallower and losing themselves in the under surfaces of the bricks.

The slot 5 in one brick meets the slot 5 in the adjoining brick and together they form a passage through thc arch, there being many of these passages. in fact all the bricks of the arch are so formed except perhaps the endbricks, which have the slot only on their inner sides.

The tubes 4 immediately above the passages formed by the slots 5 are pierced top and bottom to form the elongated holes9 and 10," into which are inserted the thimbles 11 having the flanges 12 at the upper ends of the walls '13. that project just throughthe holes 10 in the lower side of the tubes 4.

The tubes 4 are connected by the pipes 14: to the transverse tubes 15. which are supported by the furnace walls 16 and have suitable air inlets, therefore the air flowing in to the tubes 15 reaches the tubes 4 through the pipes 14. Air is drawn towards the fire box 17 through the thimbles 11' and slot passages 5, where it escapes by the channels 7 and 8 and forms a constant sheet of air over the underside of the arch, eventually mixing with the heating gases and materially adding to the volume and heating properties of the gases deflected to the water heating surfaces by the arch.

The bricks 1 are held on to the longitudi nal tubes 4 by the lock wedges 18 and the longitudinal tubes 4 are suspended from the transverse tubes 15 by means of the pipes 14 jointed to the said tubes 4 at their lower ends and to the joint members 19 from said tubes 15 and as the latter are supported by the furnace walls the said arch will be held to its uppermost position at the a arch and rows of bricksjoined to said subsidiary tubes and having passages therethrough registering with said subsidiary tubes,

2. In furnace arch construction, transverse main air tubes suitably supported in the furnace structure, T-joint members introduced in said main tubes and flanged at their lower ends, longitudinal subsidiary tubes having extensions secured to the aforesaid flanges and air passages therethrough, and rows of bricks joined to said passages through subsidiary tubes and having passages therethrough registering with passages through said subsidiary tubes.

3. In furnace arch construction, transverse main air tubes suitably supported in the furnace structure, rigid suspension members forming air passages from said tubes, subsidiary tubes secured to said suspension members, thimbles forming air passages across said subsidiary tubes and open top and bottom and rows of bricks joined to said subsidiary tubes and having passages therethrough registering with passages through said Subsidiary tubes.

4. In furnace arch construction, transverse main air tubes suitably supported in the furnace structure, longitudinal subsidiary air tubes supported by and under said mai'n tubesand communicating thereslotted sides and a tapered lower portion and channels from said slots disappearing in the inclined surfaces of the lower portion.

Signed at Montreal, Canada, this 8th day of May, 1923.

' JOHN WILLIAM GATES. 

